Yes,
these are real signs that someone is suffering
a stroke.
A fourth method is to ask them to stick
out their tongue. If it skews uncontrollably
left or right then you should call for
help right away.

That is all.

------------

Last night, mere minutes after I
had posted this comic, I learned that Star
Trek's Nichelle
Nichols, the fabulous Uhura, had suffered a stroke.
So this isn't an exploitative gag, just one with
lousy timing.